Journal of biomechanics最新文献

{"title":"Using dynamic ultrasound to assess Achilles tendon mechanics during running: The effect on running pattern and muscle–tendon junction tracking","authors":"Wouter Schallig ,&nbsp;Ytjanda Sloot ,&nbsp;Milou M. van der Schaaf ,&nbsp;Sicco A. Bus","doi":"10.1016/j.jbiomech.2024.112344","DOIUrl":"10.1016/j.jbiomech.2024.112344","url":null,"abstract":"<div><div>Achilles tendon strain can be quantified using dynamic ultrasound, but its use in running is limited. Minimal effects on running pattern and acceptable test–retest reliability of muscle–tendon junction (MTJ) tracking are prerequisites for ultrasound use during running. We aimed to assess (i) the effect of wearing an ultrasound transducer on running pattern and (ii) the test–retest reliability of MTJ tracking during running. Sixteen long-distance runners (nine injury-free, seven with Achilles tendinopathy) ran at different speeds on an instrumented treadmill with a 10-camera system tracking skin-mounted retroreflective markers, first without and then with an ultrasound transducer attached to the lower leg to track the MTJ of the gastrocnemius medialis. Spatiotemporal parameters, joint kinematics and kinetics were compared between conditions using mixed ANOVAs and paired t-tests. MTJ tracking was performed manually twice by three raters in ten participants. Variability and standard error of measurement (SEM) quantified the inter- and intra-tester test–retest reliability. The running pattern was not affected by wearing the ultrasound transducer, except for significantly less knee flexion during midstance (1.6°) and midswing (2.9°) found when wearing the transducer. Inter-rater and intra-rater SEMs for MTJ tracking to assess the tendon strain (0.43%, and 0.56%, respectively) were about four times as low as between-group differences presented in literature. The minimal effects found on the running pattern and acceptable test–retest reliability indicates that dynamic ultrasound during running can be appropriately used to study Achilles tendon mechanics and thereby help improve our understanding of Achilles tendon behavior during running, injury development and recovery.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112344"},"PeriodicalIF":2.4,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142390818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effects of soft vs. rigid back-support exoskeletons on trunk dynamic stability and trunk-pelvis coordination in young and old adults during repetitive lifting","authors":"Rahul Narasimhan Raghuraman,&nbsp;Divya Srinivasan","doi":"10.1016/j.jbiomech.2024.112348","DOIUrl":"10.1016/j.jbiomech.2024.112348","url":null,"abstract":"<div><div>While back-support exoskeletons are increasing in popularity as an ergonomic intervention for manual material handling, they may cause alterations to neuromuscular control required for maintaining spinal stability. This study evaluated the effects of soft and rigid passive exoskeletons on trunk local dynamic stability and trunk-pelvis coordination. Thiry-two young (18–30 years) and old (45–60 years) men and women completed repetitive lifting and lowering tasks using two different exoskeletons and in a control condition. Both exoskeletons significantly reduced the short-term maximum Lyapunov exponent (LyE) of the trunk (p &lt; 0.01), suggesting improved local dynamic stability. There was also a significant main effect of age (p = 0.05): older adults exhibited lower short-term LyE that young adults. Use of the soft exoskeleton significantly increased, while the rigid exoskeleton significantly decreased, long-term LyE, and these changes were more pronounced in the young group compared to the old group. Additionally, exoskeleton use resulted in significant increase (p &lt; 0.001) of mean absolute relative phase (MARP) and deviation phase (DP) by ∼30–60 %, with greater increases due to the rigid than the soft device. Thus, trunk-pelvic coordination and coordination variability were negatively impacted by exoskeleton use. Potential reasons for these findings may include exoskeleton-induced changes in lifting strategy, reduced peak trunk flexion velocity, and cycle-to-cycle variability of trunk velocity. Furthermore, although the soft and rigid devices caused comparable changes in trunk-extensor muscle activity, they exhibited differential effects on long-term maximum Lyapunov exponents as well as trunk-pelvic coordination, indicating that exoskeleton design features can have complex effects on trunk neuromuscular control.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112348"},"PeriodicalIF":2.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142365355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Does proprioceptive reweighting contribute to reactive balance strategies during slip-like perturbations? a proof-of-concept in healthy adults","authors":"Tamaya Van Criekinge ,&nbsp;Upasana Sahu ,&nbsp;Kurt Claeys ,&nbsp;Tanvi Bhatt","doi":"10.1016/j.jbiomech.2024.112341","DOIUrl":"10.1016/j.jbiomech.2024.112341","url":null,"abstract":"<div><div>Falls commonly occur during walking, particularly when struggling to respond to unexpected perturbations. Proprioception plays a significant role in detecting body destabilization even before reactions to perturbations are required. This study investigates the contribution of proprioceptive reweighting strategies to reactive balance during walking. This cross-sectional, proof-of-concept study included fifteen healthy adults (18–40 years). Ankle and back muscle vibrators disrupted proprioceptive input in stance, allowing calculation of the proprioceptive reweighting index. Walk-slip perturbations were then administered on an ActiveStep treadmill. A linear regression model assessed the significance of proprioceptive reweighting in predicting post-slip stability (margin of stability). Participants shifted from an ankle-steered to a central-steered proprioceptive strategy on a foam surface with closed eyes (Difference = 15.70 % (SD=37.87), 95 %CI [0.41, 30.99], p = 0.045). The regression model explained 22.7 % of the variance in pre-touchdown margin of stability, with proprioceptive reweighting on foam significantly contributing to post-perturbation postural control (p &lt; 0.001). Proprioceptive reweighting provides a moderate explanation for the mechanisms of reactive balance, highlighting that the key to effective balance recovery strategies may lie in the person’s ability to both detect and respond to imbalances. Further research should explore if these proprioceptive strategies are a matter of directional control and if responses differ in older adults.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112341"},"PeriodicalIF":2.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142390814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synovial fluid does not retard fluid exudation during stress-relaxation of immature bovine cartilage","authors":"C.V. Sise ,&nbsp;C.A. Petersen ,&nbsp;J. Yun ,&nbsp;S. Vukelic ,&nbsp;C.T. Hung ,&nbsp;G.A. Ateshian","doi":"10.1016/j.jbiomech.2024.112340","DOIUrl":"10.1016/j.jbiomech.2024.112340","url":null,"abstract":"<div><div>Interstitial fluid load support (FLS) is a dominant mechanism of lubrication in cartilage, producing a low friction coefficient while enhancing the tissue’s load bearing capabilities. Due to its viscosity, synovial fluid (SF) may retard loss of FLS by slowing the exudation of interstitial fluid from the cartilage. This study tested this hypothesis by comparing the stress-relaxation (SRL) response of immature bovine articular cartilage immersed either in phosphate buffered saline (PBS) or in healthy mature bovine SF, under unconfined compression (fluid exudation across cut lateral tissue boundary) and indentation testing (fluid exudation across articular surface). To investigate the influence of diffusion of SF molecular constituents into cartilage, the effect of incubation time in SF on SRL was also investigated. The SRL response in unconfined compression was not significantly different in PBS versus SF when compared directly (p = 0.98) and had a slope of<span><math><mrow><mi>m</mi></mrow></math></span> = 1.00 ± 0.04 (<span><math><mrow><msup><mrow><mi>R</mi></mrow><mn>2</mn></msup></mrow></math></span> = 0.989 ± 0.007). Samples tested in PBS exhibited characteristic relaxation times, <span><math><mrow><msup><mrow><mi>τ</mi></mrow><mrow><mi>PBS</mi></mrow></msup></mrow></math></span>=42.6 ± 5.3 s and<span><math><mrow><msup><mrow><mi>τ</mi></mrow><mrow><mi>SF</mi></mrow></msup></mrow></math></span> = 40.8 ± 4.7 s, that were not significantly different (p = 0.40). Incubation time of 24 h in SF resulted in no significant difference in the SRL response (p = 0.39, <span><math><mrow><mi>m</mi></mrow></math></span>=1.03 ± 0.12; <span><math><mrow><msup><mrow><mi>R</mi></mrow><mn>2</mn></msup></mrow></math></span>=0.983 ± 0.011, and<span><math><mrow><msup><mrow><mi>τ</mi></mrow><mrow><mi>PBS</mi></mrow></msup></mrow></math></span> = 43.4 ± 10.7 s versus<span><math><mrow><msup><mrow><mi>τ</mi></mrow><mrow><mi>SF</mi></mrow></msup></mrow></math></span> = 41.5 ± 4.8 s, p = 0.59). Indentation testing showed some statistically significant, but functionally insignificant, difference in SRL responses in PBS versus SF with a slope of<span><math><mrow><mi>m</mi></mrow></math></span> = 0.958 ± 0.060 (<span><math><mrow><msup><mrow><mi>R</mi></mrow><mn>2</mn></msup></mrow></math></span> = 0.957 ± 0.020, p = 0.029, and<span><math><mrow><msup><mrow><mi>τ</mi></mrow><mrow><mi>PBS</mi></mrow></msup></mrow></math></span> = 16.9 ± 2.6 s versus<span><math><mrow><msup><mrow><mi>τ</mi></mrow><mrow><mi>SF</mi></mrow></msup></mrow></math></span> = 19.4 ± 3.3 s, p = 0.073). Based on these results, we reject the hypothesis that healthy SF can retard the loss of FLS in cartilage due to its viscosity.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112340"},"PeriodicalIF":2.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A multiscale discrete fiber model of failure in heterogeneous tissues: Applications to remodeled cerebral aneurysms.","authors":"Ryan R Mahutga, Ruturaj M Badal, Victor H Barocas, Patrick W Alford","doi":"10.1016/j.jbiomech.2024.112343","DOIUrl":"10.1016/j.jbiomech.2024.112343","url":null,"abstract":"<p><p>Damage-accumulation failure models are broadly used to examine tissue property changes caused by mechanical loading. However, damage accumulation models are purely phenomenological. The underlying justification in using this type of model is often that damage occurs to the extracellular fibers and/or cells which changes the fundamental mechanical behavior of the system. In this work, we seek to align damage accumulation models with microstructural models to predict alterations in the mechanical behavior of biological materials that arise from structural heterogeneity associated with nonuniform remodeling of tissues. Further, we seek to extend this multiscale model toward assessing catastrophic failure events such as cerebral aneurysm rupture. First, we demonstrate that a model made up of linear elastin and actin and nonlinear collagen fibers can replicate bot the pre-failure and failure tissue-scale mechanics of uniaxially-stretched cerebral aneurysms. Next, we investigate how mechanical heterogeneities, like those observed in cerebral aneurysms, influence fiber and tissue failure. Notably, we find that failure occurs and the interface between regions of high and low material stiffness, suggesting that spatial mechanical heterogeneity influences aneurysm failure behavior. This model system is a step toward linking structural changes in growth and remodeling to failure properties.</p>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":" ","pages":"112343"},"PeriodicalIF":2.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142347221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the appropriate thread depth for bioabsorbable screws","authors":"Aorigele Yu ,&nbsp;Shinji Imade ,&nbsp;Satoshi Furuya ,&nbsp;Hiroshi Morii ,&nbsp;Daishiro Oka ,&nbsp;Koichiro Nakazawa ,&nbsp;Kazuma Shiraishi ,&nbsp;Toshihiko Kawamura ,&nbsp;Yuji Uchio","doi":"10.1016/j.jbiomech.2024.112321","DOIUrl":"10.1016/j.jbiomech.2024.112321","url":null,"abstract":"<div><div>The relatively low strength of bioabsorbable screws is a critical clinical issue. A shallower thread depth will increase a screw’s strength, but the pull-out strength of the screw will decrease proportionally with the thread depth. We sought to provide further clarification of the relationships between (<em>i</em>) the thread depth and the pull-out strength, and (<em>ii</em>) the minor diameter and the shearing and bending strengths in bioabsorbable screws made of uncalcined and unsintered hydroxyapatite particles and poly-L-lactide (u-HA/PLLA). Seven types (thread depth from 0.1–0.7 mm) of screws with a major diameter of 4.5 mm were manufactured. Each screw type’s pull-out strength was investigated using simulated bone. A shearing test and three-point bending test were both used to measure the physical strength of the screws. We then analyzed the relationships between the mechanical findings and the thread depth. The relationship between the thread depth and the pull-out strength showed a positive biphasic linear correlation with a boundary at 0.4-mm thread depth. The relationships between the minor diameter and both the shearing and bending strengths showed positive linear correlations within the range of dimensions tested. Within the scope of this study, a 0.4-mm thread depth proved to be an appropriate value that provides sufficient pull-out strength and screw strength for u-HA/PLLA screws with a 4.5-mm major diameter.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112321"},"PeriodicalIF":2.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142365353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Validity and reliability of torso- versus waist-worn inertial measurement units in the assessment of vertical jumps","authors":"Mohammad Amin Mohammadian ,&nbsp;Hoda Mozayyany ,&nbsp;Soroosh Bagheri Koudakani ,&nbsp;Sean J Maloney","doi":"10.1016/j.jbiomech.2024.112338","DOIUrl":"10.1016/j.jbiomech.2024.112338","url":null,"abstract":"<div><div>The aim of the current study was to compare the reliability and validity of jump variables determined from torso- and waist-worn inertial measurement units (IMU) in comparison to force platform measures. Twenty-seven students-athletes completed eight countermovement (CMJ) and squat jumps (SJ) on a force platform with IMUs mounted on the pelvis and torso. Variables including jump height and phase-specific duration, impulse and power were calculated from force platform and both IMUs independently. Considering both IMU locations, the coefficients of variation (CV) observed for all CMJ variables were ≤ 2.5 % larger than the force platform with the exception of concentric impulse with the torso-worn worn IMU (6.9 %). Differences in CVs observed between IMU and force platform variables appeared greater in the SJ. For velocity-derived jump height and concentric impulse from both IMU placements, and torso-worn IMU mean power, CVs were &gt; 2.5 % larger than the force platform. Both IMU placements overestimated jump height determined by flight time (+22 to +35 %) and underestimated jump height determined by take-off velocity (−10 to −18 %). In conclusion, the reliability of IMU metrics was largely comparable to the force platform. However, systematic bias was observed for most metrics. Practitioners should exercise caution if seeking to model jump performance with IMUs.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112338"},"PeriodicalIF":2.4,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142501005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tension-based abdominal aortic aneurysm rupture risk assessment improves its accuracy and reduces the time of analysis","authors":"Radek Vitásek ,&nbsp;Luboš Kubíček ,&nbsp;David Schwarz ,&nbsp;Robert Staffa ,&nbsp;Stanislav Polzer","doi":"10.1016/j.jbiomech.2024.112328","DOIUrl":"10.1016/j.jbiomech.2024.112328","url":null,"abstract":"<div><div>The biomechanical rupture risk assessment (BRRA) of abdominal aortic aneurysms (AAA) has higher sensitivity than maximal diameter criterion (<span><math><mrow><msub><mi>D</mi><mrow><mi>SEX</mi></mrow></msub></mrow></math></span>) but its estimation is time-consuming and relies on an uncertain estimation of wall thickness. The aim of this study is to test tension-based criterion in the BRRA of AAA which removes the necessity of wall thickness measurement and should be faster. For that, we retrospectively analyzed 99 patients with intact AAA (25 females). Nineteen of them experienced a rupture later. BRRA was performed with wall tension PRRI_T as a primary criterion. The ability of criterion to separate intact and ruptured AAAs at 1,3,6,9 and 12 months was estimated. Next, the receiver operating characteristics and the percentage of true negative cases for a different time to an outcome were estimated. Finally, the computational time was recorded. The results were compared to stress-based criterion <span><math><mrow><mi>PRRI</mi></mrow></math></span> and <span><math><mrow><msub><mi>D</mi><mrow><mi>SEX</mi></mrow></msub></mrow></math></span> which served as a reference. All three criterions were able to discriminate between intact and ruptured AAAs up to 9 months (p &lt; 0.05) while none of them could do for a 12 month prediction. <span><math><mrow><msub><mrow><mi>PRRI</mi></mrow><mi>T</mi></msub></mrow></math></span> exhibited a significantly higher percentage of true negatives for 12 and 9 month predictions (45 % and 20 % respectively) and similar to other criteria for other prediction times. The mean computational time for estimating <span><math><mrow><msub><mrow><mi>PRRI</mi></mrow><mi>T</mi></msub></mrow></math></span> was 19 h per patient compared to 67 h for <span><math><mrow><mi>PRRI</mi></mrow></math></span>. The tension- based BRRA of AAA leads to better outcomes for a 9 and 12 month prediction while the computational time drops by more than 70 % compared to PRRI.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112328"},"PeriodicalIF":2.4,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142365354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel arthrometer for quantitative clinical examination of the knee in three planes: Safety, reliability, minimum detectable changes, and side-to-side differences in healthy subjects","authors":"Carl W. Imhauser ,&nbsp;Erin E. Berube ,&nbsp;Akinola Emmanuel Oladimeji ,&nbsp;David Z. Shamritsky ,&nbsp;Zaid A. Zayyad ,&nbsp;Thomas J. Fraychineaud ,&nbsp;Jennifer T. Vazquez ,&nbsp;Hamidreza Jahandar ,&nbsp;Stephen Lyman ,&nbsp;Michael K. Parides ,&nbsp;Debi Jones ,&nbsp;Theresa A. Chiaia ,&nbsp;Andrew D. Pearle ,&nbsp;Danyal H. Nawabi ,&nbsp;Thomas L. Wickiewicz","doi":"10.1016/j.jbiomech.2024.112330","DOIUrl":"10.1016/j.jbiomech.2024.112330","url":null,"abstract":"<div><div>Physical examination of the knee joint is used to diagnose the type and severity of knee ligament injury; however, these exams are qualitative and subjective. To perform common physical examinations, we developed an arthrometer which quantitatively measures the load–displacement response in anterior-posterior (AP) translation, internal-external rotation (IER) and varus-valgus (VV) rotation. Here we describe safety, reliability, minimum detectable changes (MDCs), and absolute side-to-side differences in twenty young, healthy subjects (ten male, ten female, mean age: 28 ± 6 years). The arthrometer consists of an instrumented mechanical linkage, a force-moment sensor, and software for real-time visualization and recording of the load–displacement responses. During testing, the subject sits reclined in a chair with their knee fixed at 30° of flexion. Two examiners tested both knees of each subject twice to assess reliability via intraclass correlation coefficients (ICC). All subjects completed the test protocol with minimal pain and stated that they would volunteer to be tested again. Each knee required on average five minutes to test. All intra-test reliabilities were excellent (≥0.91). Intra-examiner reliabilities ranged from good to excellent (0.62–0.89), and inter-examiner reliabilities were good to excellent (≥0.72). MDCs for repeat measures were ≤ 4.5 mm, 4.6°, and 2.3° for AP, IER, and VV, respectively. The absolute side-to-side differences for this cohort averaged 3.8 mm in AP, 5.5° in IER, and 2.2° in VV. Our arthrometer was safe, testing was time-efficient, and MDCs in our cohort of healthy subjects support utilization of this device for clinical research.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112330"},"PeriodicalIF":2.4,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142400374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparison of three methods for establishing an ACL reference length in vivo","authors":"Jacqueline N. Foody ,&nbsp;Grace K. Li ,&nbsp;Patrick X. Bradley ,&nbsp;Sally J. Kuehn ,&nbsp;Charles E. Spritzer ,&nbsp;Andrzej S. Kosinski ,&nbsp;Jocelyn R. Wittstein ,&nbsp;Louis E. DeFrate","doi":"10.1016/j.jbiomech.2024.112337","DOIUrl":"10.1016/j.jbiomech.2024.112337","url":null,"abstract":"<div><div>As anterior cruciate ligament (ACL) injuries are highly prevalent among active individuals, it is vital to better understand the loading conditions which lead to injury. One method for doing so is through measurement of dynamic, <em>in vivo</em> ACL strain. To measure strain, it is necessary to normalize elongation of the ACL to a ‘reference length’ which corresponds to the point at which the ligament transitions from being unloaded to carrying tension. The purpose of this study was to compare the length of the ACL in three different positions to evaluate their utility for establishing a reference (or zero-strain) length of the ACL.</div><div>ACL reference length was determined using three different methods for each of ten healthy participants. Using magnetic resonance and biplanar radiographic imaging techniques, we measured the length of the ACL during supine resting, quiet standing, and anterior/posterior (AP) drawer testing. During the AP drawer testing, the slack-taut transition point was defined as the inflection point of the AP translation vs ACL elongation curve.</div><div>There was good consistency between the three ACL length measurements (ICC=0.80). Differences in mean ACL length between the three methods were within 1 mm.</div><div>While determining the precise zero-strain length of the ACL <em>in vivo</em> remains a challenge, the reference positions utilized in this study produce consistent measurements of ACL length. These findings are important because reliable measurements of <em>in vivo</em> ACL strain have the potential to serve as indicators of propensity for injury.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"176 ","pages":"Article 112337"},"PeriodicalIF":2.4,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}